731 
No. 145.] 
how important it is for us to be acquainted with our insects in 
the different stages of their lives, that we may be able to discrimi¬ 
nate friends from foes, and know which to destroy and which to 
cherish. 
The preparatory states of but a very few species of the exten¬ 
sive family of insects to which the borer now under consideration 
belongs, appear to have been hitherto noticed; and, so far as I am 
able to ascertain, the only figure of a larva like this which infests 
our Apple trees, which has yet been published, is that o t Jigrilus 
Fagi, in Dr. Ratzeburg’s work on the Forest Insects of Europe, 
(plate ii, fig. 8 c.) 
The form of this borer is quite singular, and bears some resemblance to that of a 
tadpole, or a battledoor. It consists of a very large, round, flattened portion, ante¬ 
riorly, which is suddenly tapered into a long cylindrical tail or handle-like portion. 
The broad anterior part of this worm is about two-tenths of an inch in diameter and 
the narrow posterior part is but half as wide. Its length is about 0.65. It is soft, 
flesh-like, aud of a pale yellow color. In front two short robust 
jaws of a deep black color and highly polished are slightly pro¬ 
truded. When these are spread apart the tips of the feelers aud 
between them the lips ate perceptible. The head is blackish 
brown and polished, and is deeply sunk into the second segment. 
Near each outer angle of the head is a small, pale yellow, bead¬ 
like protuberance, which is probably the antenna. In Dr. Ratze¬ 
burg’s figure, above alluded to, this slight protuberance is repre ; 
seated, probably incorrectly, as arising from the second segment. 
The second segment is deeplj sunk into the third, aud like all the 
remaining segments is pale yellow, and clothed with short minute hairs. The third 
or large segment is rather more broad than long, and is round nnd flattened above 
and beneaih. Its upper side is occupied by a large, callous-like, trarisveise-oval ele¬ 
vation, the surface of which is flat and covered with numerous brown raised points, 
and in the middle are two smooth imprissed lines, which diverge from the anterior 
to the posterior margin. Between these, on the middle of the basal edge, is a more 
faintly impiessed line, running forward, but becoming effaced before it reaches the 
centre. On the under side is also a callous-like elevation, similar in all respects to 
that on the upper side, except that in place of the impressed lines it has in its middle 
a single channel or furrow, which does not extend to the posterior nor quite to the 
anterior margin. The fourth segment is a third narrower than the preceding, and 
has an impressed transverse line in its middle. In the deeply impressed suture 
which divides this from the third segment, on each side, is a smooth, crescent shaped, 
elevated spot of a chestnut brown color, resembling a little tick adhering in the fold 
of the skin. The nine remaining segments are of nearly equal length and diameter, 
except the two last, which are successively narrower. They are separated from 
each other by sutures which are strongly constricted. Along the middle of the back 
